Cohorts
Most physicians in the Ob&Gyn study sample were women (79.5 %) who on the average were significantly (P < 0.001) younger and less experienced than the men (Table 2). The number of respondents from each of the six
Table 2. Study sample: Ob&Gyna
n = 375♀ / 97♂
|
Mean (♀/♂)
|
Min. (♀/♂)
|
Max. (♀/♂)
|
Mean difference in years
(P < 0.001)
|
95% CI in years
|
Effect size
|
Age
|
45 / 53
|
28 / 29
|
90 / 82
|
9
|
6 / 12
|
0.68
|
Work experience
|
13 / 22
|
< 1 year
|
46 / 50
|
8
|
5 / 11
|
0.61
|
a: Welch’s t-test was used, Levene's test being significant (P < 0.05)
health care districts in Sweden was proportional to the number of its inhabitants and births (Supplementary Material: Figure S1). The number of women and men in the general population was approximately equal (48 % women and 52 % men), age followed a normal distribution with an average of 29,6 years (min. 19 years and max. 66 years) and there were no significant age differences between sexes.
Personality traits and cognitive ability
The reliability analysis showed an adequate Cronbach’s alpha for all five personality traits in the Ob&Gyn sample: 0.82 for neuroticism, 0.77 for extraversion, 0.73 for openness, 0.62 for agreeableness and 0.73 for conscientiousness. On average, women scored significantly higher than men for: neuroticism (d = 0.45, P < 0.001), agreeableness (d = 0.55, P < 0.001) and conscientiousness (d = 0.31, P < 0.01). No significant differences were found between sexes in scores for: extraversion (d = 0.18), openness (d = – 0.06) and cognitive ability (d = 0.12). The personality trait scores for the general population sample, based on the same 30 items used in the simplified version of the FFM for Ob&Gyn (ie, IPIP-NEO-30), were also found reliable: 0.84 for neuroticism, 0.86 for extraversion, 0.68 for openness, 0.79 for agreeableness and 0.82 for conscientiousness. Furthermore, convergence validity (r = 0.86, P < 0.001) was found between scores based on the full 120 items (ie, IPIP-NEO-120) and the IPIP-NEO-30 scores for the general population. On average, women scored significantly higher than men for: neuroticism (d = 0.44, P < 0.001), extraversion (d = 0.18, P < 0.001), openness (d = 0.13, P = 0.005), agreeableness (d = 0.65, P < 0.001) and conscientiousness (d = 0.18, P < 0.001). The data set for the general population did not contain information about cognitive ability.
Differences between Ob&Gyn and the general population
The initial comparison of personality traits scores between Ob&Gyn and the general population showed significant differences (P < 0.001). On average, Ob&Gyn was found to score lower on neuroticism (d = – 1.08) and to score higher on extraversion (d = 0.80), agreeableness (d = 1.00) and conscientiousness (d = 0.95) compared to the general population. No significant difference was found for openness. However, when adjusting for sex and age, new differences between the study groups appeared for openness, while remained for the other traits (Table 3, and Supplementary Material: Figure S2).
Table 3. Effect of various factors on personality traits (B = Estimate, SE = Standard Error, β = standardized estimate).
|
Neuroticism
(R2 = 0.21)***
|
|
|
Extraversion
(R2 = 0.10)***
|
|
|
Openness
(R2 = 0.02)***
|
|
|
|
B
|
SE
|
β
|
B
|
SE
|
β
|
B
|
SE
|
β
|
The general population – Ob&Gyn
|
0.41***
|
0.05
|
0.47***
|
– 0.49***
|
0.04
|
– 0.74***
|
0.09**
|
0.03
|
0.17**
|
Woman – Man
|
0.25***
|
0.03
|
0.38***
|
0.09***
|
0.04
|
0.14***
|
0.11***
|
0.02
|
0.21***
|
Age
|
– 0.01***
|
0.00
|
– 0.19***
|
– 0.00
|
0.00
|
– 0.01
|
0.00***
|
0.00
|
0.09***
|
|
Agreeableness
(R2 = 0.21)***
|
|
|
Conscientiousness
(R2 = 0.15)***
|
|
|
|
B
|
SE
|
β
|
B
|
SE
|
β
|
The general population – Ob&Gyn
|
– 0.31***
|
0.03
|
– 0.55***
|
– 0.37***
|
0.04
|
– 0.62***
|
Woman – Man
|
0.29***
|
0.02
|
0.51***
|
0.08***
|
0.02
|
0.14***
|
Age
|
0.01***
|
0.00
|
0.16***
|
0.01***
|
0.00
|
0.16***
|
***: P < 0.001, **: P < 0.01, *: P < 0.05
Correlations between Ob&Gyn personality traits and decision-making styles
The reliability analysis for each of the decision-making styles was found adequate: 0.70 for Individual (using items 23.1 to 23.4), 0.62 for Team (using items 23.7 to 23.9) and 0.60 for Flow (using items 23.11 to 23.15). The calculated Cronbach’s alpha of Flow was 0.590. Items 23.5, 23.6 and 23.10 were excluded to increase reliability. The significant results from the correlation analysis are presented in table 4. The correlation factor of work experience and age being close to one
Table 4. Correlation matrix between personality traits and decision-making styles
|
Work experience
|
Neuroticism
|
Extraversion
|
Openness
|
Agreeableness
|
Conscientiousness
|
Individual
|
Team
|
Neuroticism
|
– 0.34***
|
|
|
|
|
|
|
|
Extraversion
|
|
– 0.26***
|
|
|
|
|
|
|
Openness
|
0.11*
|
|
0.18***
|
|
|
|
|
|
Agreeableness
|
|
|
0.23***
|
0.18***
|
|
|
|
|
Conscientiousness
|
|
– 0.30***
|
0.23***
|
|
0.22***
|
|
|
|
Cognitive ability
|
– 0.14**
|
|
– 0.15***
|
|
|
|
|
|
Individual
|
0.30***
|
– 0.28***
|
0.14**
|
0.17***
|
0.20***
|
0.17***
|
|
|
Team
|
– 0.23***
|
0.15**
|
0.13**
|
0.16***
|
0.18***
|
|
0.09*
|
|
Flow
|
|
|
|
0.11*
|
|
|
0.12**
|
0.15**
|
***: P < 0.001, **: P < 0.01, *: P < 0.05
(r = 0.94, P < 0.001), we only chose to use work experience in the table. To control for all five personality traits as well as covariates, results from multiple linear regression analysis (Table 5) for
Table 5. Regression models: the effects of personality traits on the decision-making styles (B = Estimate, SE = Standard Error, β = standardized estimate).
|
Individual
(R2 = 0.18)***
|
|
|
Team
(R2 = 0.15)***
|
|
|
Flow
(R2 = 0.05)*
|
|
|
|
B
|
SE
|
β
|
B
|
SE
|
β
|
B
|
SE
|
β
|
Sex
|
0.02
|
0.06
|
0.05
|
0.13*
|
0.06
|
0.26*
|
0.10
|
0.08
|
0.16
|
Age
|
0.00
|
0.01
|
0.02
|
0.01*
|
0.01
|
0.31*
|
– 0.00
|
0.01
|
– 0.03
|
Work experience
|
0.01
|
0.01
|
0.22
|
– 0.02***
|
0.01
|
– 0.46***
|
0.01
|
0.01
|
0.10
|
Neuroticism
|
– 0.13***
|
0.04
|
– 0.17***
|
0.10*
|
0.04
|
0.12*
|
0.07
|
0.06
|
0.07
|
Extraversion
|
0.00
|
0.03
|
0.00
|
0.08*
|
0.04
|
0.10*
|
– 0.06
|
0.05
|
– 0.06
|
Openness
|
0.06
|
0.03
|
0.09
|
0.12***
|
0.03
|
0.16***
|
0.11*
|
0.04
|
0.11*
|
Agreeableness
|
0.14**
|
0.05
|
0.15**
|
0.12*
|
0.05
|
0.11*
|
0.09
|
0.07
|
0.07
|
Conscientiousness
|
0.06
|
0.04
|
0.07
|
0.02
|
0.05
|
0.02
|
– 0.09
|
0.06
|
– 0.08
|
Cognitive ability
|
– 0.00
|
0.02
|
– 0.01
|
0.02
|
0.02
|
0.04
|
– 0.04
|
0.03
|
– 0.08
|
***: P < 0.001, **: P < 0.01, *: P < 0.05
Individual decision-making style indicated that there was a significant model effect from sex, age, work experience, personality traits and cognitive ability, (F (9,419) = 10.20, P < 0.001, R2 = 0.18). Each individual predictor was examined further and indicated that neuroticism (β = – 0.17, P < 0.001) and agreeableness (β = 0.15, P = 0.002) were significant predictors in the model. Results from multiple linear regression analysis for Team decision-making style indicated that there was a collective significant effect between the sex, age, work experience, personality traits and cognitive ability (F (9,421) = 7.93, P < 0.001, R2 = 0.15). Each individual predictor was examined further and indicated that sex (ie, being a woman) (β = 0.26, P = 0.032), age (β = 0.31, P = 0.019), work experience (β = – 0.46, P = 0.001), neuroticism (β = 0.12, P = 0.025), extraversion (β = 0.10, P = 0.041), openness (β = 0.16, P < 0.001) and agreeableness (β = 0.11, P = 0.021) were significant predictors in the model. Results from multiple linear regression analysis for Flow decision-making style indicated that there was a collective significant effect between the sex, age, work experience, personality traits and cognitive ability (F (9,417) = 2.20, P = 0.021, R2 = 0.05). Each individual predictor was examined further and indicated that openness (β = 0.11, P = 0.021) was a significant predictor in the model. The cognitive ability was not related to the decision-making styles.